Centrifugal pump.



A. SIEGEL & I. GOLDSTEIN.

GENTRIFUGAL PUMP.

APPLICATION FILED JUNE 24, 1910.

Patented June 3, 1913.

Inv'encofs, August Sis-g el, F'r-anz.Gol s teir 1. y

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AUGUST SIEGEIJ, 0F CHARLOTTENBURG, AND'FRANS GQLIDSTEIN, 0F BERLIN,GER-- MANY, ASSIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEWYORK.

Specification of Letters Patent.

GENTRIFUGAL PUMP.

Patented June 3,1913.

I Application filed June 24, i910. Seria1'No.568,6 5 3.

To all idiom 7'2 may concern." lie it known that we, AUGUs'r SiEGEL anFin-ins Go'LDsTnm, subjects of the Emperor of Germany, residing,respectively,.at Charlottenburg and Berlin, Germany, have inventedcertain new and useful Improvements in Centrifugal Pumps,-of which thefollowing-is a specificatio-n. v x

The invention relates to centrifugal pumps used for exhausting air,gases, vapors, .e'tc.,'

from largechambers, suchfor example,.as.

condensers, and more'especially to means'fon starting such pumps in animproved and ei'licicnt manner. v

In the accompanying drawing illustrating one mode ofapplying.the-invention, Figure 1 is an elevation showing the generalargrangement of the apparatus, some of the parts being in section; and.Figs. '2' and- 3. showmodifications ofcertainparts of the apparatus. a i

In installations where throwing an pumps are used to exhaust condensersor other large chambers, a considerable quantity of a special throwingmedium notnecessary for'o'rdinary operation has to be supplied to thepump when starting up before'a degree of vacuum is created suilicient toautomatically draw'the regular throwing medium into the pump. Thisspecial or supplementary medium is usually water under pressure. The

present invention reduces to a minimum the consumption of thesupplementary or" auxiliary starting medium thereby effecting a materialsaving-fin the operation of the ap.'

paratus; The starting medium is not only in many cases difiicult toobtain; but it is also difficult to remove and is considerable expense.

. In our invention atleast one cut-ofi' memher is arranged between thecentrifugal. air pump and the region tobeexhausted so that the pipe orpipes connecting the two can be shut off i in such a manner that whenthe' pump is being started, the gases to be drawn oficannot pass toitssuction chamber or can do so only gradually.

In e der to obtain the degree of vacuum requisite to automaticallysupply the pump with throwing water with the arrangementjust described,it is only necessary after the pump has been brought to the desiredspeed of rotation to furnish a small quantity of ,waterfrom the.auiziliary source of supply.

(hecause of sucked from the condenser through the-connec'ting' pipe or.pipes by the action of the throwing" water,.sa1d pipe being opened to ja limited extent until the suction has pro.- duced such a degree ofvacuum in the condenser, that the pipe can be opened to the degreedesiredfor regular operation witht-hethrowing water by the pump.

To reduce the quantity of starting water' to a minimum and to utilize assmall a degree of vacuum as possible for drawing in which is-at rest-inthe throwing water condint and has to be set in. motion by said vacuum,is made as short as possible. Tosccure these Important .results, thestarting water'under pressure is introduced into the out endangering theautomatic suction of v rmv the throwing water, the column of fluidthrowing water supply pipe as near the beginning; of said. pipeas-possible; so that the starting water before entering, the pump willforce thev column of fluid infsaid pipe the throwing Water suction pipeinthis maner, no more wateras usedjthan' if it were introduced directly.into. the pump, since the water already in the suction-pipe which is'.forced forward is used asthrowing' or start-- 'ing water and assistsin producmg; the .de-

sired vacuum.

Referring. to the drawing, the throwing air pump 4 is driven by anysuitable inotor and is connected by the pipe, or

conduit 5 to the condenser 6 fromw-h ch it removesgases andvapors. Theflow through the pipe 5 is controlled by a valve 7 provided, witha'smallopening or by-pass 8 in the valve disk which, when the valve isclosed, permits only a small quantity of .gas or vapor to be drawn fromthe condenser. I The throwing water is taken from the tank-or well 9,having an overflow 10 to preventf flooding. The throwing water passesfrom the Well through the pipe 11 to a cooler 12 of any approvedconstruction and from the. cooler through. the pipe 13 to the inlet ofthe, pump 4. The discharge ahead oi! it, thereby' bringing the contentsof the pipe into movement in a: direction favorable for subsequentsuction by the pump. By supplyingthe starting water to centrifugal fromthe pump passes throu'ghthe ipe 14 to the well, the water replenishingti ply in the well and the air passing off.

The starting water is supplied from any 5 suitable source by a pipe 15which joins the given point through which alr, etc, mustpipe 11 as closeto the well sis/possible. A three-Way valve 16 controls the flow fromeither the pipe 11 or the pipe 15 to the cooler 12, pipe 13 and the pump4.

Instead of providing the valve 7 with an opening 8, the valve canbesomewhat loosely fitted or it can be provided with some kind of-a stopor indicating device which will permit a known small opening thereofadapted to the conditions. Or these devices and theopening '8 can beomitted and a byass 17, Fig. 2, arranged around the valve with a valve18 in said by-pass to regulate the size of the passage or opening at apass from the condenser to the pump when the valve 7 is closed. Thissmall opening in the by-pass can also be obtained by 1nserting aperforated plate 19, Fig. 3, between the flange 20 on the pipe 5and theflange 21 on the by-pass pipe 17.

WVith the last arrangement, it is only necessary when connecting thepump to another condenser or when adopting other condi- I tions ofoperations to replace the plate or disk 19 by another having a suitablydifi'erent perforation in order to obtain the best operating conditionsfor these particular cases. 7

The method of operating the apparatus when starting the pump is asfollows :The valve 7 is closed eitherlbefore starting the pump or duringstarting or after the pump 7 has been brought to the desired speed ofrotation. The three-way valve 16 is then so adjusted that it shuts ofi'the pipe 11 and supplies starting water from the pipe 15 to l the pumpthrough the pipe 13. The starting water flows intothe pump impeller andspeedily creates a vacuum sufiicient to draw throwing water from thewell 9 through the parts 11, 12 and 13. When said vacuum is established,the valve 16 isvshifted to shut off the pipe 15 and connect the pipe 11to the pump. The efiicient suction of the throwing water from the well 9by the least possible vacuum in the pump is facilitated by making thejunction of the pipe 15 with the pipe 11 as close to the well 9 aspossible, so t at the water and air in the cooler 12 v and the pipe 13are set in motion in a direc- "f tionfavorable to the suction of thewater from the well 9. Hence only a small quart, tity of fluid has to beaccelerated by the vacuum. This vacuum is formed in a very short time,since by reason of the small ie sup tlirowingIwatefi-fthe, valve 7 1being closed, .until such a vacuum is formed in the condenser thatsaidvalve canbe opened without. causing the vacuum in the pump to fall somuch that the throwing water cannot be 'drawn into the pump by it. Itis, moreover, immaterial to the operation by this method whether thesmall opening for permitting a restricted flow is introduced between thecondenser and the pump before or during the starting of the pump, Thus,for example, a shut-ofi' member or valve,,such as 18, may be placed inthe by-pass 17, which valve is not opened until after such a vacuum isestablished in the pump that a small quantity of air, vapor, etc, may besucked through said opening without impairing the vacuum in the pump toany objectionable extent.

In accordance with the provisions of the patent statutes, we havedescribed the principle of operation of our invention, together with theapparatus which We now consider to represent the best embodimentthereof; but we desire to have it understood that the apparatus shown isonly illustrative, and

that the invention can be carried out by other means.

What'we claim as new and desire to secure by Letters Patent of theUnited States, 1s

ljIn combination, a condenser chamber,

a throwing pump for exhausting the chant,

ber, awell, a conduit through which throwing water is drawn from thewell into the pump by suction, a starting water conduit connected to thefirst conduit at a point adjacent to the .well for supplying Water underpressure to set the contents of the first conduit in motion toward thepump, valve means for controlling the flow through the two conduits, aconduit leading from the pump discharge to the well, a conduitconnecting the pump with the chamber, and valve means in the lastmentioned conduit including a device having an area less than the fullopening of said conduit for per mitting a flow from the portion of theconduitat one side of said means to the portion at "the opposite sidethereof when said means is closed.

a throwing pump for exhausting the chamber, means for supplying startingand regu-.

lar throwing water to the pump, a connection between the pump and thechamber, a valve in said connection, and a by-pass around said valvehaving an area less than the full valve opening for permitting a flowfrom one side of the valve to the other when said valve is closed.

3. In combination,. a chamber, a throwing pumplfor exhausting thechamber, a conduit tor supplying throwing water from a suitable sourceto the pump, a conduit oonnected to the throwing water conduit ad jacentits inlet end for supplying starting water to the pump under pressure,means controlling the flow through said conduits, a connection betweenthe pump and the chamber, and means for varying the effective area ofsaid connection.

4. In combination, a condenser chamber, a throwing pump for exhaustingthe chamher, a conduit supplying throwing water from a suitable sourceto the pump, a con-' duit connected to the throwing water con-" arealess than the full valve opening for permitting a flow from one side ofsaid valve means to ,the other.

5. In combination, a chamber", a throwing chamber, and valve means insaid connection including a devlce having an pump for exhausting thechamber, a Well, a conduit supplying throwing water from the Well to thepump, a cooler arranged in said conduit, a starting water conduitconnected to the first conduit between the well and the cooler, athree-way valve at't-he junction of said conduits for controlling thefiow therethrough, a conduit leading from the pump discharge to thewell, a conduit connecting the pum {to the chamber, and a valve in saidcoil uit provided with by-pass means having a flow area less than thefull valve opening for permitting a flow from one side ofthe valve to.the other,

In'witness whereof, we have hereunto set our hands this 8th'day of June,1910.

AUGUST SIEGEL. FRANS GOLDSTEIN.

Witnesses HENRY HASPER, .VVOLDEMAR HAUPT.

Copies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

